Spark-tip.



G. A. H. HENRIX.

I 198- 1,277,929. Patented Sept. 3, 1918;

wmvro/e GAHHenrz'z.

By M c I ATTORNEYS GUSTAV A. H. HENRIX, OF CHICAGO, ILLINOIS.

SPARK-TIP.

Specification of Letters Patent.

Patented Sept. 3, 1918.

Application filed January 30, 1918. Serial N 0. 214,460.

To all whom it may concern: 7

Be it known that I, GUSTAV A. H. HEN RIX, a subject of the King of Sweden, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and Improved Spark-Tip, of which the following is a full, clear, and exact description,

In practice, the spark tip to which the invention particularly relates is employed on a lighting device having two arms, one carrying an abrading cylinder or equivalent roughened device, the other arm having a bent end to receive the sleeve of the spark tip, so that a relative movement of the two arms rubs the pencil over the roughened cylinder, causing the pencil to spark.

My invention relates to devices for lighting gas and like purposes, and involving a spark tip functioning when subjected to the action of an abrading element such as a file. Spark tips of the character referred to include a tubular holder or sleeve and a plug or short pencil of sparking material held thereby. The sleeve has been pressed onto the metal and other securing means provided but the result leaves much to be desired because of the fact that the plug or pencil of sparking materialis uneven and the sleeve does not have a firm contact at all points about the pencil, the result of which is that the pencil, which is very brittle, is exceedingly liable to break when subjected to the abrading action for producing the spark.

The object of my invention is to overcome the mentioned defects in spark tips and to produce a tip in which the surface contact at all points is insured between the tubular holder and the sparking material. The stated purpose is attained by molding the sleeve onto the plug or pencil so that the material constituting the sleeve thoroughly contacts with any uneven surfaces of the sparking material and in addition the shrinkage of the molded sleeve in cooling insures the further tight union between the sleeve and the pencil or plug, whereby breakage by reason of the uneven contact is avoided.

Reference is to be had to the accompanying drawing in which the figure is a sec- Copies of this patent may be obtained for tional side elevation of a spark tip formed in accordance with my invention.

In carrying out the invention in practice a pencil orplug 10 of approved sparking metal is provided and I form thereon a sleeve 11 so that suflicient of the plug 10 Will project beyond the forward end of the,

sleeve. The sleeve 11 I mold of suitable metal by any approved molding methods. The result is that the molten material from which the sleeve 11 is formed enters all surfaces of the plug 10 and in cooling the shrinkage of the sleeve 11 forms a firm union between the shell and plug. The molding of the sleeve 11 furthermore results in practice in an internal flange 12 being formed on. the sleeve 11, directly adjacent to the rear end of the plug 10 to form an additional resistance to any force tending to displace the plug by pressure against the front end thereof. 7

By the described arrangement, when the sleeve 11 is applied to the bent end of the carrying arm of the lighting device (not shown) the pencil 10 can be used up close to the end of the sleeve, thereby promoting economy, since when the spark tip is discarded by removing the sleeve 11 from its carrying arm, only the small fragment at the base of the pencil is discarded.

Having thus described my invention, I claim as new, and desire tosecure by Letters Patent:

1. A spark tip including a plug of sparking material, and a holder therefor consisting of a metal shell molded and shrunk onto ing material and a metal holder shell cast onto the plug for a portion of the length thereof, the interior surface of the shell conforming to the uneven external surface of the plug, said shell having an integral flange thereon directly adjacent to the rear end of the plug. I

GUSTAV A. H. HENBIX.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

